7 Troubleshooting
MAGNETEK HPV1000 AC Elevator Drive Technical Manual 57
oH4
Motor Overheat Fault (PTC thermistor
input):
• The motor overheat signal to analog
input terminal A1 or A2 exceeded the
fault detection level.
Parameter settings are incorrect.
• Verify that the C5 sub-menu analog input of “Motor PTC” is set correctly.
• Verify that the analog input gain setting and bias offset in the A1 sub-menu
are set correctly: Term A1 Gain (A1), Terminal A1 Bias (A1), Ana In A1
Offset (A1), Term A2 Gain (A2), Terminal A2 Bias (A1), and Ana In A2
Offset (A1).
Motor thermostat wiring is fault (PTC thermistor input).
• Repair the PTC thermistor input wiring.
Motor has overheated.
• Check the size of the load, the accel/decel times, and the cycle times.
• Decrease the load.
• Lower the acceleration and deceleration in the A2 sub-menu.
• Adjust the preset V/f pattern in the A5 sub-menu.
• Be careful not to lower Motor Mid Volts (A5) and Motor Min Volts (A5)
too much, as this reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current as indicated on the motor nameplate in Rated
Motor Curr (A5).
Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
oL1
Motor Overload
Motor OVLD Alarm
The electronic motor overload protection
tripped.
Load is too heavy.
• Reduce the load.
Note: After the value of Motor Overload (D2) has decreased to
one less than 100, reset oL1. The value of Motor Overload
(D2) must be less than 100 before oL1 can be reset.
Cycle times are too short during acceleration and deceleration.
• Lower the acceleration and deceleration times in the A2 sub-menu.
A general purpose motor is driven below the rated speed with too high load.
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor
capacity or use a motor specifically designed to operate in the desired
speed range.
The output voltage is too high.
• Adjust the user-set V/f pattern by reducing Motor Mid Frequency A (A5)
and Motor Min Frequency (A5).
Note: Do not reduce either parameter too low because this
reduces load tolerance at low speeds.
The wrong motor rated current has been set.
• Check the Rated Motor Curr (A5).
• Perform auto-tune in U9 sub-menu.
The Base Frequency is set incorrectly.
• Enter the rated frequency on nameplate to Base Frequency (A5).
Multiple motors are running off the same drive.
• Disable the motor protection function in Mtr OL Method (A5) and install a
thermal relay to each motor.
The electrical thermal protection characteristics and motor overload
characteristics do not match.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected in Mtr OL
Method (A5).
• Install an external thermal relay.
The electrical thermal relay is operating at the wrong level.
• Check the current rating listed on the motor nameplate.
• Check the value set for the current in Rated Motor Curr (A5).
Output current fluctuation due to power supply loss.
• Check the power supply for phase loss.
Fault Code/Name Description Causes and Solutions
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